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Cant find the manual or my 320 A/B P. My serial isnt listed

My serial number starts with an R, then 6 numbers. All of the manuals I see have 2 letters and none of them are R. Any info on why my serial number seems "off". It is stamped into the front of the machine where it says serial number. From pics I have seen it appears to be a 60's model but I would love to find out the exact mfg date on it etc... Any way to find out?

My serial number starts with an R, then 6 numbers. All of the manuals I see have 2 letters and none of them are R. Any info on why my serial number seems "off". It is stamped into the front of the machine where it says serial number. From pics I have seen it appears to be a 60's model but I would love to find out the exact mfg date on it etc... Any way to find out?

Thanks! Looks like my machine was built in 66 sometime. way older then I thought it was. Still works great. Ill give them a call probably later in the week to try and get it. I've read some things that are contradictory for how it needs setup for tig vs arc welding etc...